BIPN 100 Problem solving session - BIPN 100 Problem solving...

BIPN 100 Problem solving session Wednesday May 13, 2009 Vascular diseases can affect cardiovascular function in many different ways. If a heart valve becomes damaged, often the damage can be detected by a change in the heart sounds, called a heart murmur. a. How would changes in a heart valve cause changes in the heart sounds? b. If the mitral valve becomes floppy- it no longer completely separates the left atrium from the left Incompetent valves: we replace them c. formation of scar tissue can cause narrowing of aorta- aortic stenosis. How would this affect cardiovascular function? Could the heart compensate for any problems caused by this? Think Q= ∆P/R Ohm’s Law This would increase the flow resistance, so less systemic circulation, unless there is an increase in the pressure gradient. There would be an increase in pressure gradient if heart works harder. In order to maintain flow, the heart has to work harder. d. The major veins in lower body contain a series of one-way valves that allow the blood to flow to the heart and not away from it. Why might such valves have evolved in these veins? The valves permit flow from the feet towards the heart, but prevent flow from heart back to the feet. e. in some people. The venous valves are quite thin and are easily damaged. The valves become

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